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Structure of reversible CatS and CatC nitrile inhibitors used in this study. A, compound 1, (S)-2-amino-N-((1R, 2R)-1-cyano-2-(4′-(4-methylpiperazin-1-ylsulfonyl) biphenyl-4-yl)cyclopropyl)butanamide. B, compound 2, N-(1-cyanocyclopropyl)-3-((2,3-difluorobenzyl)sulfonyl)-2-((2,2,2-trifluoro-1-(4-fluorophenyl)ethyl)amino)propanamide. C, compound 3, β-(2-thienyl)-l-alanyl-d-phenylalanine nitrile.
